Certified Professional Horticulturist (CPH) Practice Exam

Which condition is often crucial for successfully overwintering tender plants outdoors?

1. Minimal exposure to wind

2. Soil compaction

3. Consistent moisture

4. High temperatures

The correct answer is: Minimal exposure to wind

Successfully overwintering tender plants outdoors requires careful attention to environmental conditions, and minimal exposure to wind is a crucial factor. Wind can exacerbate temperature fluctuations, leading to increased stress on plants. It can cause desiccation, where plants lose moisture faster than they can absorb it from the soil. This is particularly problematic for tender plants that may not have strong root systems established to cope with harsh winter conditions. By providing a sheltered environment that limits wind exposure, the risk of damage due to wind chill and moisture loss can be significantly reduced, better ensuring that tender plants have a chance to survive the winter months. Addressing the other options, while consistent moisture is important, too much moisture can lead to root rot and other issues, particularly in colder conditions. Soil compaction generally hinders root growth and water drainage, which is not ideal for maintaining the health of tender plants. High temperatures during winter can be detrimental as well, as tender plants may not be adapted to warm spells in an otherwise cold climate, which could disrupt their dormancy and lead to vulnerability once temperatures drop again.